#include <iostream>
#define Day 7
using namespace std;

int main()
{
    //#define 宏常量
    //const修饰的变量

    //Day = 14; //宏常量不可以修改
    
    cout << "一周有" << Day << "天" << endl;

    //const修饰的变量
    const int month = 12;
    //month = 24; //const修饰的变量不可以修改
    cout << "一年有" << month << "个月" << endl;

    return 0;
}